Suppose that in the past the standard deviation of weights of certain 100.0-oz packages filled by a
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Suppose that in the past the standard deviation of weights of certain 100.0-oz packages filled by a machine was 0.8 oz. Test the hypothesis H0: σ = 0.8 against the alternative H1: σ > 0.8 (an undesirable increase), using a sample of 20 packages with standard deviation 1.0 oz and assuming normality. Choose α = 5%.
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Prove it The mean weight is 1000 oz and the sample mean is 992 oz The sam...View the full answer
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